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rst: Formalize the shared resource restore order

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2013-08-29 08:07:15 +04:00
parent cb648fb934
commit 7a16734ed5
4 changed files with 17 additions and 6 deletions
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10
include/crtools.h
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@@ -189,4 +189,14 @@ static inline int in_vma_area(struct vma_area *vma, unsigned long addr)
addr < (unsigned long)vma->vma.end;
}
/*
* When we have to restore a shared resource, we mush select which
* task should do it, and make other(s) wait for it. In order to
* avoid deadlocks, always make task with lower pid be the restorer.
*/
static inline bool pid_rst_prio(unsigned pid_a, unsigned pid_b)
{
return pid_a < pid_b;
}
#endif /* __CR_CRTOOLS_H__ */